My dad still has his '57 Lawn Boy running, the kind where the front wheel is on a up-and-down moving arm like in this video:
1957 Lawn-boy first start in 20 years. - YouTube
A couple of years after he got it new, someone backed over it with a car and he had to get a replacement deck which must've been made for Canada because it had the familiar Lawn Boy warning: "Keep feet from under the machine" in French. All I remember is the last two words: "la tondeuse" which means "clippers" - my boyhood introduction to a foreign language.